where \(\Lambda \)  is a constant. This is such a strong departure from the behaviour of the RN metric there, \(-g_{tt} \sim +Q^2/r^2\) , that one may wonder what type of matter fields could generate it. Actually, NEDs are able to do the job [1]}, though the corresponding models do not come free of theoretical difficulties as every other model does in trying to overcome the constraints of the singularity theorems (at least within GR). This kind of configurations go collectively under the name of de Sitter cores [2]}, [3]}, and are a well known mechanism invoked in the literature for the removal of space-time singularities.
